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CVE-2008-3656 is an algorithmic complexity vulnerability in the WEBrick::HTTPUtils.split_header_value function, used by WEBrick::HTTP::DefaultFileHandler in Ruby versions 1.8.5 and earlier, 1.8.6 through 1.8.6-p286, 1.8.7 through 1.8.7-p71, and 1.9 through r18423. The vulnerability arises from the use of a backtracking regular expression that can be exploited by a specially crafted HTTP request, leading to excessive CPU consumption during request processing.
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1 valid exploit after Mallory filtered fakes, detection scripts, and README-only repos (1 hidden).
This repository contains a single Metasploit auxiliary module (modules/auxiliary/dos/http/webrick_regex.rb) designed to exploit a denial of service (DoS) vulnerability in Ruby's WEBrick HTTP server (CVE-2008-3656). The exploit targets specific vulnerable versions of Ruby WEBrick by sending a specially crafted HTTP request with a large 'If-None-Match' header, causing excessive CPU consumption on the server. The module is written in Ruby and leverages Metasploit's Remote::HttpClient and Auxiliary::Dos mixins. The only configurable endpoint is the URI path (default '/'), and the exploit is executed by the 'run' method, which sends the malicious request to the target. The module is a proof-of-concept (POC) for the DoS vulnerability and does not provide post-exploitation capabilities.
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